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Retire captures pruning

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Futility captures alone does not seem an improvment.

Perhaps is a combination of stand pat + futility that is winning,
so revert for now and continue testing starting from a standard
base until we find the correct receipe.

After 999 games at 1+0
Mod vs Orig +231 0506 -201  +10 ELO

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2010-01-29 00:16:00 +01:00
parent 252844e899
commit e84488ed6b
1 changed files with 0 additions and 30 deletions
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30
src/search.cpp
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@ -1629,36 +1629,6 @@ namespace {
// Update current move
movesSearched[moveCount++] = ss[ply].currentMove = move;
// Futility pruning for captures
// FIXME: test disabling 'Futility pruning for captures'
// FIXME: test with 'newDepth < RazorDepth'
Color them = opposite_color(pos.side_to_move());
if ( !isCheck
&& newDepth < SelectiveDepth
&& !dangerous
&& pos.move_is_capture(move)
&& !pos.move_is_check(move, ci)
&& !move_is_promotion(move)
&& move != ttMove
&& !move_is_ep(move)
&& (pos.type_of_piece_on(move_to(move)) != PAWN || !pos.pawn_is_passed(them, move_to(move)))) // Do not prune passed pawn captures
{
int preFutilityValueMargin = 0;
if (newDepth >= OnePly)
preFutilityValueMargin = FutilityMargins[int(newDepth)];
Value futilityCaptureValue = ss[ply].eval + pos.endgame_value_of_piece_on(move_to(move)) + preFutilityValueMargin + ei.futilityMargin + 90;
if (futilityCaptureValue < beta)
{
if (futilityCaptureValue > bestValue)
bestValue = futilityCaptureValue;
continue;
}
}
// Futility pruning
if ( !isCheck
&& !dangerous